Ring in triumph on entry (5)
I believe the answer is:
phone
'ring' is the definition.
(I know this)
'in triumph on entry' is the wordplay.
'in' says the answer is hidden in the clue.
'PHONE' is hidden in the letters of 'triumph on entry'.
(Other definitions for phone that I've seen before include "Covert monitoring of electronic exchanges" , "Receiver" , "Mobile, perhaps" , "Short piece of electronic equipment" , "Ring (someone)" .)